/*******************************************************************************

 * Copyright (c) 2010 Nokia and others.

 * All rights reserved. This program and the accompanying materials

 * are made available under the terms of the Eclipse Public License v1.0

 * which accompanies this distribution, and is available at

 * http://www.eclipse.org/legal/epl-v10.html

 *

 * Contributors:

 * Nokia - Initial API and implementation

 *******************************************************************************/

package com.nokia.carbide.cpp.internal.api.sdk;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectStreamClass;

import org.eclipse.core.runtime.IPath;

import org.eclipse.core.runtime.Path;

import com.nokia.carbide.cpp.sdk.core.SDKCorePlugin;

import com.nokia.cpp.internal.api.utils.core.CacheUtils;

public class SDKCacheUtils extends CacheUtils {

	private static final String CACHE_FOLDER_NAME = "CarbideSDKCache"; //$NON-NLS-1$

	private static SDKCacheUtils cache;

	public static SDKCacheUtils getCache() {

		if (cache == null)

		{

			IPath path = new Path(System.getProperty("user.home"));

			cache = new SDKCacheUtils(path.append(CACHE_FOLDER_NAME));

		}

		return cache;

	}

	public SDKCacheUtils(IPath defaultLocation) {

		super(defaultLocation);

	}

	protected CacheEntry loadCachedData(IPath location, String cacheIdentifier) {

		IPath flushPath = location.append(Integer.toString(cacheIdentifier.hashCode())).addFileExtension("txt");

		if (flushPath.toFile().exists()) {

			try {

				final ClassLoader classLoader = SDKCorePlugin.getDefault().getClass().getClassLoader();

				FileInputStream fis = new FileInputStream(flushPath.toFile());

				ObjectInputStream ois = new ObjectInputStream(fis) {

					@Override

					protected Class<?> resolveClass(ObjectStreamClass desc)

					throws IOException, ClassNotFoundException {

						String name = desc.getName();

						try {

							return classLoader.loadClass(name);

						} catch (ClassNotFoundException e) {

							return super.resolveClass(desc);

						}

					}};

					return new CacheEntry(ois);

			} catch (Exception e) {

				e.printStackTrace();

			}

		}

		return null;

	}

}